Freightliner Cascadia. Instruction - page 24
Brake Chamber Stroke Specifications
Chamber
Max Applied Stroke: inch (mm)
Manufacturer
Type
*
Size
†
Dana Spicer
Long Stroke
16L
2 (51)
20L
24L
24LS
2-1/2 (64)
30LS
*
Long stroke design is indicated by a tag, or embossing, on the brake chamber.
†
Specifications are relative to a brake application with 80 to 90 psi (550 to 620 kPa) air pressure in the brake chambers.
‡
If type 36 chamber is used, slack length should be less than 6 inches.
Table 1, Brake Chamber Stroke Specifications
5.
Start the engine and build air pressure to at least
100 psi (689 kPa). Shut down the engine.
6.
Check all of the foundation brake components for
damage, wear, and loose or missing parts. Re-
pair as needed. See Group 42 of the vehicle
Workshop Manual for repair procedures.
42–06 Haldex Slack Adjuster
Lubrication
Automatic slack adjusters that have a grease fitting
must be lubricated periodically to ensure proper
brake operation.
WARNING
Failure to lubricate slack adjusters could lead to
dragging brakes or a brake failure, resulting in
property damage, personal injury, or death.
CAUTION
Do not use moly-disulfide-loaded grease or oil.
Both the life and reliability of the slack adjuster
will be reduced if this type of grease is used.
Lubricate the automatic slack adjuster at the grease
fitting. See
. Use standard chassis lubricant for
Haldex slack adjusters.
42–07 Meritor Camshaft
Bracket Lubrication
IMPORTANT: Perform a brake inspection before
lubricating the camshaft bracket.
f422363c
06/26/2007
Fig. 5, Haldex Automatic Slack Adjuster Grease Fitting
Brakes
42
42/8
NOTE: If equipped with an extended-
maintenance Q Plus
™
brake system, the cam-
shaft bracket will not have a grease fitting.
These camshafts use a special NLGI Grade
synthetic polyurea grease and do not require
lubrication for 3 years or 500,000 miles (800
000 km), whichever comes first. The extended-
maintenance camshaft bushings are lubricated
during the brake reline service interval. For ser-
vice and lubrication instructions, see Group 42
of the vehicle Workshop Manual.
For camshaft brackets with grease fittings, use an
NLGI Grade 1 or Grade 2 multipurpose chassis
grease. Lubricate the camshaft bushings through the
grease fitting on the camshaft bracket or the spider
until new grease flows from the inboard seal. See
.
WARNING
If grease leaks out under the camhead, the cam-
shaft bracket grease seal is worn or damaged. See
Group 42 in the vehicle workshop manual for
grease seal replacement instructions. If this seal
is not replaced, the brake linings could become
contaminated with grease. The stopping distance
of the vehicle will be increased, which could result
in personal injury or property damage.
42–08 Meritor Slack Adjuster
Lubrication
IMPORTANT: Perform a brake inspection follow-
ing the instructions in this group before lubricat-
ing the slack adjusters.
WARNING
Failure to lubricate slack adjusters could lead to
dragging brakes or a brake failure, resulting in
property damage, personal injury, or death.
NOTE: If equipped with an extended-
maintenance Q Plus
™
brake system, the slack
adjuster will not have a grease fitting. These
slack adjusters use a special NLGI Grade syn-
thetic polyurea grease and do not require lubri-
cation for 3 years or 500,000 miles (800 000
km), whichever comes first. The extended-
maintenance slack adjusters are lubricated dur-
ing the brake reline service interval. For service
and lubrication instructions, see Group 42 of
the vehicle Workshop Manual.
For slack adjusters with grease fittings and for oper-
ating temperatures above –40°F (–40°C), use an
NLGI Grade 1 clay-base grease, or an NLGI Grade 1
or 2 lithium-base grease.
For slack adjusters with grease fittings and for oper-
ating temperatures below –40°F (–40°C) and above
–65°F (–54°C), use an NLGI Grade 2 synthetic oil,
clay-base grease.
Lubricate the slack adjuster at the grease fitting until
grease is forced past the pressure-relief capscrew or
past the gear splines around the inboard snap ring.
See
.
42–09 Bendix E-6 Foot Control
Valve Inspection and
Lubrication
1.
Remove the brake valve from the vehicle; see
Group 42, of the vehicle Workshop Manual.
2.
Remove the roll pin from the brake pedal pivot
pin. See
.
3.
Remove the brake pedal pivot pin.
f420011a
05/28/93
1
2
3
A
A. Grease Exit
1.
Brake Chamber
2.
Slack Adjuster
3.
Non-Pressure-Relief
Grease Fitting
Fig. 6, Camshaft Bracket Lubrication
Brakes
42
42/9
4.
Remove the brake pedal.
5.
Check the brake pedal mounting plate adapter
for signs of wear or cracks at the bosses (the
area from which the pivot pin was removed). Re-
place it if necessary.
6.
Check the brake pedal rollers for signs of wear
or cracks. Replace the rollers as needed.
7.
If the rollers are replaced, replace the roller pin,
install a new cotter pin, bend it to 90 degrees
and apply Torque Seal (OPG F900 White) to the
cotter pin.
8.
Remove the plunger from the valve. Using alco-
hol, clean the existing grease from the plunger.
Check the plunger for signs of wear or cracks.
Replace it if necessary.
9.
Lubricate the plunger with barium grease (BW
246671).
10. Insert the plunger in the valve.
11. Install the brake pedal with the pivot pin.
12. Install a new roll pin and apply Torque Seal
(OPG F900 White) to the roll pin.
13. Install the brake valve assembly; see Group 42,
of the vehicle Workshop Manual.
14. Test the brakes before returning the vehicle to
service.
42–10 WABCO System Saver
Air Dryer Desiccant
Cartridge Replacement
NOTE: The following instructions apply to the
System Saver 1200, 1200 Plus, and Twin air
dryers.
NOTICE
The WABCO System Saver air dryers can use ei-
ther a standard or oil coalescing desiccant car-
tridge. When replacing the desiccant cartridge, it
is very important to use the same type of car-
tridge that was originally installed on the dryer. Oil
coalescing cartridges can be used in any applica-
tion, but require more frequent service intervals
(every 1 to 2 years instead of every 2 to 3 years
for a standard cartridge). Do not replace an oil co-
alescing cartridge with a standard cartridge, as
f420012a
10/20/93
1
2
3
4
5
6
7
1.
Brake Chamber
2.
Clevis
3.
Actuator Rod
4.
Boot
5.
Pressure-Relief Capscrew, Gasket, Pawl Spring,
and Pawl
6.
Manual Adjusting Nut
7.
Grease Fitting (or plug)
Fig. 7, Meritor Automatic Slack Adjuster
09/10/2004
f430405
1
2
3
4
6
7
8
5
1.
E-6 Foot Control Valve
2.
Mounting Plate
3.
Nut and Washer
4.
Pivot Pin
5.
Roll Pin
6.
Roller
7.
Roller Pin
8.
Pedal
Fig. 8, Brake Pedal and Valve Assembly
Brakes
42
42/10
this may result in contamination and malfunction-
ing of downstream air system components.
Refer to
for cartridge replacement.
1.
Drain the air system.
2.
Using a strap wrench, turn the desiccant car-
tridge counterclockwise and remove it.
3.
Remove and discard the O-ring.
4.
Clean the top surface of the dryer base with a
commercial cleaning solvent.
IMPORTANT: If the air dryer base is damaged,
preventing a tight seal, replace the air dryer.
5.
Using a multipurpose, high-temperature grease
that resists water, steam, and alkali, lightly coat
the surfaces of the new O-ring and the dryer
base. Install the O-ring.
6.
Thread the desiccant cartridge onto the dryer
base (turn clockwise). When the seal contacts
the base, tighten the cartridge one complete turn
more. Do not overtighten.
42–11 Versajust Slack Adjuster
Inspection and
Lubrication
IMPORTANT: Perform the Brake Inspection
maintenance operation before lubricating the
slack adjusters.
1.
Visually check for physical damage, such as bro-
ken air lines and broken or missing parts.
2.
Using a quality multipurpose chassis lubricant,
NLGI Grade 2, lubricate the slack adjuster
through the grease fitting until clean lubricant
flows from the grease relief opening in the boot.
3.
Perform the "In Service Inspection."
In Service Inspection
1.
Apply and release the brakes several times while
observing the slack adjuster. The slack adjuster
and brake actuator should move freely, without
binding or interference, and should return to the
full released position. Observe the looseness that
exists between the clevis and adapter bushing
and the yoke and link pins and their mating parts
(clevis, body, link). Replace these parts if loose-
ness appears excessive. Make certain the brake
actuator pushrod jam nut is tightened securely.
2.
Inspect the slack adjuster for physical damage,
paying attention to the link, boot, and clevis. If
any components are damaged, repair or replace
them as necessary.
3.
Measure the brake actuator pushrod stroke while
making an 80 to 90 psi (552 to 621 kPa) brake
application. Actuator pushrod strokes should not
exceed the values shown in
and
. To achieve the correct pressure for this
test, build the system pressure up to a 100 psi
(690 kPa). Shut down the engine. Fan the
brakes to attain a 90 to 95 psi (621 to 655 kPa)
reading. Make and hold a full brake application
while the strokes are checked.
Actuator Stroke–Standard Stroke
Brake Actuator Size
Recommended Maximum
Operating Stroke (Inches)
30
2
24
1-3/4
08/05/94
f421292
1
2
3
1.
Seal
2.
O-Ring
3.
Air Dryer Base
Fig. 9, Desiccant Cartridge Replacement
Brakes
42
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